From Switch statements:

Most of the time, when(EXPR) is treated as an implicit smart match of $_, i.e. $_ ~~ EXPR. (See "Smart matching in detail" for more information on smart matching.) But when EXPR is one of the below exceptional cases, it is used directly as a boolean:
Since $re->m1 is true, when ( $re->m1 ) succeeds.

UPDATE: I just noticed that the elided list is followed by

In those cases the value of EXPR is used directly as a boolean.
… in case you didn't believe it the first time, I guess. :-)

In reply to Re: given-when with compiled regular expression returned from method confusing behavior by JadeNB
in thread given-when with compiled regular expression returned from method confusing behavior by whakka

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